variables = x, y, z, vx, vy, vz, index
zone T="index"
0 0.5  0 1 0 0 9
0 1    0 1 0 0 8
0 1.5 0 1 0 0 7
0 2.0 0 1 0 0 6
0 2.5 0 1 0 0 5
0 3.00 0 1 0 0 4
0 3.5 0 1 0 0 3
0 4.00 0 1 0 0 2
0 4.50 0 1 0 0 1
